Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99d8c378d2fe38d…

MALICIOUS

PDF

84.7 KB Created: 2021-04-10 15:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cc5289dd9c5658aa8c10e91dc8a2bbb SHA-1: 6920e3f1fa1d178ea7144dd5f4e63f390a27fd16 SHA-256: c99d8c378d2fe38d469d94bba11073daf152450abe7e916c4e15583ac52d1e73
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, identified as a link farm, pointing to various domains including 'vilenefex.ru' and 'latencfsrt.space'. This behavior is indicative of a phishing or SEO manipulation scheme, where the document acts as an initial lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=learn+how+to+make+a+conversation+in+english
    • http://latencfsrt.space/dilapovajadabukxu58.pdf
    • https://cdn.sqhk.co/kakapoxavu/diejbhb/96700143712.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_6052b543173d4.pdf
    • https://cdn.sqhk.co/bagadogod/zgdjahg/visolavudekisekilokom.pdf
    • https://static.s123-cdn-static.com/uploads/4459321/normal_6000f23c8cf80.pdf
    • https://cdn.sqhk.co/tumupowe/Ugdhfjb/69360067027.pdf
    • http://abwaab.su/9916227222l653r.pdf
    • https://cdn.sqhk.co/xawobovuji/pBRheha/rtc_bonneville_transit_center_hours.pdf
    • https://cdn-cms.f-static.net/uploads/4489713/normal_606827619f233.pdf
    • http://rent-nout.site/josikovagisefavexn60dm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_ab58c9db051042a2852839a79626d4a2.pdf?index=true
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_425e95e6bb0c4a55a1df5416d36e3f90.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/mn_attorney_general_contact_information.pdf
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_9036230e254d458da03216a29ab5f73a.pdf?index=true
    • https://s3.amazonaws.com/zarusegibitumet/razezutetige.pdf
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_f35aa335b0db4fd899d743e38e6ad37b.pdf?index=true
    • https://s3.amazonaws.com/pasutiz/best_diet_plan_for_lean_body.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_630fbed010ef4a51b832c0c4016c0eea.pdf?index=true
    • https://c5b3e1fc-3b55-407d-a8d9-2bfa6c9015c1.filesusr.com/ugd/6df244_c988c3af853c4478b09031994aef203b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f609.bin
4bc2a3859031daf0d9c462dc9359fe52a1913ea2a76fba63d41985ba937602de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 5368 bytes
font_01_sfnt_off00010841.bin
414d1f816552c0c919e93b45f76764d8b402145db68e5a104501860c06341567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 11316 bytes
font_02_sfnt_off00012f28.bin
94d3cb1cb955e79326becda893dbc28162358a0598f3d436d9ab749bffec2032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 16392 bytes

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